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Refueling the Past

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Re: Sluggish 12V Starter
atomarc #1402410 Sun Mar 21 2021 09:41 PM
Joined: May 2005
Posts: 8,244
B
Sir Searchalot
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Watch out for careful drivers!!!
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Re: Sluggish 12V Starter
atomarc #1402760 Wed Mar 24 2021 05:14 AM
Joined: Jul 2004
Posts: 5,712
A
atomarc Offline OP
'Bolter
Well, heck. Two big fat cables..the negative a #2, fully charged battery and clean connections all over and the stupid starter isn't real frisky. Sometimes it spins the motor perfectly, then the barely moves it at all. I think there is something funky with the starter but don't know what. All the segments of the comm check out and, although I'm not sure what the growler checks, the electric shop supposedly checked that and I'll assume it was OK. I installed new brushes, but let them seat themselves.

I wonder what else can make a starter spin with vigor then barely move at all. It's like there is a dead or weak spot where it stops sometimes.

Stuart

Re: Sluggish 12V Starter
atomarc #1402813 Wed Mar 24 2021 03:44 PM
Joined: Feb 2004
Posts: 22,578
H
'Bolter
A growler checks for unwanted circuits in the armature, ones that create induced current that opposes the rotation of the armature. When an oscillating magnetic field is induced into the armature core by the growler, if there's a copper-to-copper "short" in the windings, a hacksaw blade or other thin steel strip will vibrate when it's passed over the armature. A "ground" is an unwanted copper-to-steel circuit, and it's found by touching a test light to the commutator and the shaft. A final test is for continuity, done by touching the test light probes to adjacent pairs of commutator bars all the way around. If the armature passes all these tests, it's good. I'd recommend looking for a loose or corroded grounded brush holder that's making intermittent contact with the end frame or housing, which would explain the good and bad performance at times. If somebody has done a really good job of painting a "rebuilt" starter, that can also interfere with current flow between the components, and/or the bell housing.
Jerry


The murder victim was drowned in a bathtub full of Rice Krispies and milk.
The coroner blamed the crime on a cereal killer!

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Re: Sluggish 12V Starter
atomarc #1402861 Wed Mar 24 2021 08:03 PM
Joined: Jul 2004
Posts: 5,712
A
atomarc Offline OP
'Bolter
Jerry,

Thank you for that.

Stuart

Re: Sluggish 12V Starter
atomarc #1402862 Wed Mar 24 2021 08:29 PM
Joined: Oct 2015
Posts: 324
P
'Bolter
Just out of curiosity , is this a freshly rebuilt engine ??

John


good planning is no substitute for dumb luck
Re: Sluggish 12V Starter
atomarc #1402927 Thu Mar 25 2021 03:50 AM
Joined: Jul 2004
Posts: 5,712
A
atomarc Offline OP
'Bolter
John,

No, not fresh at all, but in great condition. The current draw seems to be up there, but the engine isn't new and tight so that is part of the question. I used the machine today and it started nanoseconds after I hit the key, so I'm going to take potluck and call it a done deal.


Stuart

Re: Sluggish 12V Starter
atomarc #1404866 Mon Apr 05 2021 03:49 PM
Joined: Dec 2002
Posts: 4,173
Moderator - The Electrical Bay and Rocky Mountain Bolters
Stuart, how is your starter working? Is this problem solved?


Another quality post.


Real Trucks Rattle

HELP! The Paranoids are after me!
Re: Sluggish 12V Starter
atomarc #1408197 Sat May 01 2021 07:30 PM
Joined: Jul 2004
Posts: 5,712
A
atomarc Offline OP
'Bolter
The forklift starts, but it's touch and go with the starter. There is just flat out something wrong with it. New big fat cables, new battery, new brushes on a polished and undercut comm..good armature bushings, etc. It growled fine but it's obvious there is something wrong as it spins great sometime and barely chugs on the next try.

The machine is not often used and I have other fish to fry..so, it's not solved but short of replacing it, I've lost interest.

Thank you for asking.

Stuart

Re: Sluggish 12V Starter
atomarc #1408262 Sun May 02 2021 02:46 AM
Joined: Jun 2011
Posts: 4,119
E
'Bolter
Many starters have a bushing in the flywheel end, when that bushing gets worn, the shaft is off center causing the symptoms you describe. Easy to replace bushing.

Ed


'37 GMC T-18 w/ DD 4-53T, RTO-610, 6231 aux., '95 GMC running gear, full disc brakes, power steering, 22.5 wheels and tires.
'47 GMC 1 ton w/ 302, NP-540, 4wd, full width Blazer front axle.
'54 GMC 630 w/ 503 gasser, 5 speed, ex fire truck, shortened WB 4', install 8' bed.
'55 GMC 370 w/270, 420 4 speed, grain, dump bed truck from ND. Works OK.
Re: Sluggish 12V Starter
atomarc #1408399 Mon May 03 2021 05:52 AM
Joined: Jul 2004
Posts: 5,712
A
atomarc Offline OP
'Bolter
Ed,

I wish that was the problem in my case...but not so, sir!

Stuart

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